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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Readily biodegradable: 90 % (O2 evolution) in 14 days (OECD 301C, read across to Dibutyl adipate CAS 105-99-7)

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

Since no studies investigating the ready biodegradability of Diisopropyl adipate (CAS 6938-94-9) are available for this endpoint, in accordance to Regulation (EC) No. 1907/2006 Annex XI, 1.5 Grouping of substances and read-across, a read-across to the structurally related category member Dibutyl adipate (CAS 105-99-7) was conducted.

Further justification is given within the endpoint summary 5 and within the category justification section 13. In this case of read-across, the best suited (highest degree of structural similarity, nearest physico-chemical properties) read-across substance within this category was used

The study with Dibutyl adipate (CAS 105-99-7) was conducted by Japanese authorities according to OECD 301C under aerobic conditions using mixtures of activated sludge from STP with freshwater from rivers and lakes, marine water and marine sediments (METI, 1995). Based on oxygen consumption a mean degradation of 90% was observed after 14 days.

Due to the structural and property similarities with the tested category member Dibutyl adipate (CAS 105-99-7), this result also applies to Diisopropyl adipate (CAS 6938-94-9). Hence, Diisopropyl adipate (CAS 6938-94-9) can be classified as readily biodegradable according to OECD criteria.

This conclusion is supported by the fact that even the longer-chained adipates in the category with alcohol side chains of C6 to C13, such as Dihexyl adipate (CAS 110-33-8), Diisooctyl adipate (CAS 1330-86-5 or Bis(tridecyl) adipate (CAS 16958-92-2), show biodegradation > 60% within 28 day and hence are also determined to be readily biodegradable.